Radiopaque marker



FIG. 1 is a perspective view of a radiopaque marker showing my new design;

FIG. 2 is a stereogram view of the radiopaque marker;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in FIG. 1 represent an environment and form no part of the claimed design. 

CLAIM The ornamental design for a radiopaque marker, as shown and described. 